A Dobrushin-Lanford-Ruelle theorem for irreducible sofic shifts

Conformal measures and the Dobrushin-Lanford-Ruelle equations

We demonstrate the equivalence of two definitions of a Gibbs measure on a subshift over a countable group, namely a conformal measure and a Gibbs measure in the sense of the Dobrushin-Lanford-Ruelle (DLR) equations. We formulate a more general version of the classical DLR equations with respect to a measurable cocycle, which reduce to the classical equations when the cocycle is induced by an interaction or a potential, and show that a measure satisfying these equations must be conformal. To ensure the consistency of these results with earlier work, we review methods of constructing an interact…

sofic群作用的Lanford-Ruelle定理

The Lanford-Ruelle theorem for actions of sofic groups

本研究将经典Lanford-Ruelle定理推广至sofic群作用情形，证明满足拓扑Markov性质的子移位上，最大化sofic压强的平移不变测度为Gibbs态，还给出平衡测度唯一性等应用及Chung变分原理的简短证明。

Equivalence of relative Gibbs and relative equilibrium measures for actions of countable amenable groups

We formulate and prove a very general relative version of the Dobrushin-Lanford-Ruelle theorem which gives conditions on constraints of configuration spaces over a finite alphabet such that for every absolutely summable relative interaction, every translation-invariant relative Gibbs measure is a relative equilibrium measure and vice versa. Neither implication is true without some assumption on the space of configurations. We note that the usual finite type condition can be relaxed to a much more general class of constraints. By "relative" we mean that both the interaction and the set of allow…

Gibbs measures as unique KMS equilibrium states of nonlinear Hamiltonian PDEs

The classical Kubo-Martin-Schwinger (KMS) condition is a fundamental property of statistical mechanics characterizing the equilibrium of infinite classical mechanical systems. It was introduced in the seventies by G. Gallavotti and E. Verboven as an alternative to the Dobrushin-Lanford-Ruelle (DLR) equation. In this article, we consider this concept in the framework of nonlinear Hamiltonian PDEs and discuss its relevance. In particular, we prove that Gibbs measures are the unique KMS equilibrium states for such systems. Our proof is based on Malliavin calculus and Gross-Sobolev spaces. The mai…